Rockwell

Coupling Capacitor
Input Transformer
Output Impedance

The ampsandsound Rockwell brings the legendary Direct Heated Triode sound to personal audio. We chose the 6B4G as it stand tall next to other top shelf triodes while still being accessible in NOS form. Combining a single gain stage, zero feedback, and careful attention to grounding techniques, we can use a the Large 6B4G Triode with headphones without hum or noise. 

The Rockwell tube amp pairs a 6SL7 tube for the front end with tube rectification enabling excellent transient peeks, faster/livelier presentation, and ultra-quite operation. The Rockwell uses direct-heated triodes with zero feedback providing the classic single-ended sound so widely loved.


Typical of all ampsandsound amplifiers, the power supply is massive. This, combined with a generous choke, yields our trademark low noise; less than 1.5mV at the idle, and stable output of 3 watts RMS into an 8ohm load and 2 watts into a 32ohm headphone. Frequency response is 12hz to 30hz at 1 watt, 1-dB. Carefully selected output iron reduces distortion and increases frequency response. And of course, we also use our 5% capacitors and 2% resistors.

The motivation of the Rockwell is to provide access to the wide availability of NOS tubes and give the warm mid-range bloom that is at the heart of single-ended direct-heated triode designs. Tube set included.

Headphones driven successfully or tested with the amp include, Focal Utopia, ZMF VC, ZMF Eikons, Hifiman Suvara,Hifiman HE100SE, Hifiman Sundara, Hifiman Arya, MrSpeakers Ether2, MrSpeakers Ether Cs, Audeze LCD2 through LCD4s,AKG701, SonyMDR-Z1R, Sennheiser 6xx, Sennheiser HD800, Beyerdynamic T1-32oh, Grado Labs SR-60, RS1i

Input sensitive: with 6SL7 input @ 1.2V P-P

Noise: @ 300ohm/HiZ     1.5mV RMS

Noise: @ 100ohm          1.2mV RMS

Noise: @ 32ohm           550mV RMS

Noise: @ 16ohm           450mV RMS

Noise: @ 8ohm LoZ       430mV RMS

Max Power @    8ohm   @ 3.2 watts RMS

Max Power @   32ohm   @ 2.5 watts RMS

Ultra-wide bandwidth; 12hz to 22khz @ 1 watt -1db

Power and Noise specs are dependent on tube selection.

All ampsandsound amps are handmade in Southern California with custom hand-wound output transformers and U.S. sourced parts.

 

Our amps are hand made by a small team with quality being our first priority.